Joe Thomas has gone from playing in front of the Dawg Pound to getting bitten by them -- the Cleveland Browns legend was viciously attacked by canines in a crazy demonstration at a military base!!
The 2023 Hall of Fame inductee and fellow ex-NFL star Whitney Mercilus hit up the Randolph Air Force Base in San Antonio ... where they got a full VIP meet and greet with the four-legged military sidekicks that are trained to locate explosives, narcotics, and personnel.
Thomas and Mercilus found out firsthand just how talented these doggos are .